掺氢比对低热值气体发动机燃烧性能的影响

Effect of Hydrogen Addition Fraction on Combustion Performance of Low Heat Value Gas Engine

基于台架试验开展了发动机燃用2种典型低热值气体燃料(煤层气、沼气)掺混氢气燃烧性能的试验研究,分析了掺氢比对发动机燃烧特性参数的影响和对低热值气体发动机燃烧稳定性的影响。结果表明:低热值气体掺混氢气后,改善了低热值气体发动机的燃烧性能,最大缸压值上升,其对应的曲轴转角前移,燃料燃烧的火焰发展期大幅降低;随着掺氢比的增加,发动机平均指示压力更加集中分布在均值附近,且掺氢比越高,效果越明显。

Based on bench test, combustion performance tests of 2 typical low heat value （LHV） gas fuels, i.e. , coal seam gas and biogas mixed with hydrogen for engine were studied. The influences of hydrogen addition fraction on engine combustion performance parameters and combustion stability of LHV gas engine were analyzed respectively. The results show that the hydrogen addition to LHV gas can improve the combustion performance of the LHV gas engine. The maximal pressure increases, the crank angle positions of the maximal pressure were advanced. Meanwhile, hydrogen addition can decrease the flame development duration. The mean indicated pressure of engine shows higher and concentrated value with increase of hydrogen addition. This effectiveness becomes more remarkably at high hydrogen addition fraction.